Advanced schedule

1. Enable org-tss-mode for org-mode files:

   (require 'org-tss-mode)
   (add-hook 'org-mode-hook #'org-tss-mode)
       

2. Enjoy. Now multiple timestamps will be repeated in earliest-first manner

   * TODO Czech class
   <2020-01-13 Mon +1w>
   <2020-01-15 Wed +1w>
       

3. Make it DONE and it should repeat only the earliest date:

   * TODO Czech class
   :PROPERTIES:
   :LAST_REPEAT: [2021-12-08 Wed 18:33]
   :END:
   :LOGBOOK:
   - State "DONE"       from "TODO"       [2021-12-08 Wed 18:33]
   - State "DONE"       from "TODO"       [2021-12-08 Wed 18:33]
   :END:
   <2020-01-20 Mon +1w>
   <2020-01-15 Wed +1w>